Involved pain

When some internal organs are diseased, the phenomenon of hypersensitivity or pain in a certain area of ​​the body surface is called reffered pain. For example, in the early stages of appendicitis, pain often occurs in the upper abdomen or around the umbilicus; myocardial ischemia or infarction, and pain often occurs on the body surface of the anterior region, left shoulder, left ulnar side, or left neck; in gallbladder disorders, often on the right shoulder Body pain and so on. Involved pain is an important physiological characteristic of visceral pain. The structural basis for causing the involved pain may be: (1) The primary sensory fibers of diseased organs enter the spinal cord and then terminate in unique secondary neurons on the one hand, and on the other hand Branches are finally involved in somatosensory neurons. (2) The primary sensory fibers of the diseased organ and the corresponding body structure are finally the same secondary neuron; (3) There are different side altars around the primary sensory neuron that are distributed in the internal organs and corresponding body structures.